Grinding machine



F. E. GARDNER GRINDING MACHINE Fled'June' '20, 1921 March 31, 1925.

5 Sheets-Sheet l1 Much 31. 1925; 1,531,215:V

F. E, GARDNER GINDINe MACHINE Filed June. 20. 19213 5 SheetsSheet 2March 31, 1925.

F. E. GARDNER GRINDING MACHINE n Filed Jun@ 20. 1921 5 ShetsShet, 3

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Filed'aune 2 0. 1921 5 Snsmlsnm s Patented Mar. 31, 1925..`

FREDERIC E. GARDNER, or BELCIT, WISCONSIN.Y

GRINDING- MACHENE.

Application filed .Time 20, 1921. Serial No, 473,830.

To all 'whom t may concern:

Be it known that I, FREDERIC E.' GARDNER, a citizen of the UnitedStates, residing at Beloit, in the kcounty yof Rock and State of 5lVisconsin, have invented certain new and useful Improvements inGrinding Machines, of which the following is a specification.

lily invention relates to vgrinding machines and particularly to thattype comprising a rapidly revolving grinding disk and a revolving workcarrier on which objects to be ground aresecui'ed to be successivelycarried into grinding relation'with the grinding wheel.

20 above the carrierso that work lis applied by the carrier against theunder side of the grindingelement.

Another important object of thefrinven- Q tion is to provide` improvedmeans'for adjusting the distance between the axes of the carrier andgrinding elenient'to obtain the desireddegree of overlap and the bestrelative position for application of work to the grinding element.`

A. further object is to provide means for readily adjustingthegrinding-element vertically. I

A further object is to provide simple and ellicient means for yieldablyapplying work against the grinding face after such worl has been-broughtinto the grinding field by the carrier. j v

i The above and other features of'my in- 'vention are dis-closed in themachine shown on the a lconipanyii'ig drawing,y it being understood,however, vthat changes and modi-` fications could readily beniade whichwould still come within theseope of mvinvention.

On the drawings-- K Fig. 1 is a side elevational View.

Fig. 2 is a front elevational view.

Fig. 3 is anfenlarged sectional view on plane 3?3j Fig. 2.

Fig. 4t is an enlarged plan view ofthe 'd work carrying frame with partsbroken away.

tra

One of the important objects of lmy in-,

Fig. 5 is an underside View of the work carrying frame with parts brokenaway.

Fig.` 6 is an enlarged sectionalview on plane 6 6, Fig. 1, and F ig. 7is an enlarged sectional view on Y plane 7 7, Fig. 2.

Generally describing the machine, itcoinprises a grinding diskarranged-to revolve on a vertical axis,r below whichv disk a workcarrier frame is arranged to revolve on ya vertical axis, the axes beingoffset so thatv the disks Aand carrier overlap only partially. On thecarrierare mounted a series of work holding tables which aresuccessively raised by cam mechanism to present supported work to thegrinding surface.

The carrier structure is adjustable toward or away from the grindingaxis andthe grinding wlieelis vvertically adjustable. Y- Y.

The driving trains for the grinding and carrier elements are arrangedwithiny the base framelO, the pedestal frame 11 and the top Iframe 12detachably connected together as shown in Fig. 1. In the journal boxes13 and 14 on the base frame is journaled the maindriving shaft 15 drivenby a pulley 16 with belt or otherwise.v At the inner end of the driveshaft'is the bevel pinion 17 which meshes with the bevel gear 18 on thecountershaft 19 journaled inthe base frame at rightangles with the shaft15. 'At its outer end the countershaft carries thespur pinion 20whichmeshes with the spur gear 21 yrotatable idly on a'secondcountershaft 22 and adapted to be connected in driving'relation withVsaid shaft by suitable clutch'mechanism 23 operatedfrom the front ofthermachiiie by means of the lever 24. At the front of the machineVandparallel with the countershaft is the worm shaft 25 which isjournaled at its left end in bearings 26 and 27 provided in the lower.endsrof the arms 2,8 and 29 depending from the base 30 ,on ywhich thework carrier frame R is supported. At its right end the shaft 25 isslidable in but splined to thel hub 31 which has bearing in the journalboxes 32 and 33 provided in the base frame 10. Keyed on the hub are thespur, gears 34 of different diameters for meshing with suitably sizedgears 35 detachably secured on the outer end of the countershaft 22. Acover 36 is provided on the base frame so that ready access may be hadfor applying suitable gears on the shaft 22 to get the desired speedtransmission from the shaft 15 to the countershaft 25.

Between the bearing boxes 26 and 27 the shaft 25 carries a worm 37 whichmeshes with the worm wheel 38 secured to the lower end of the vert-icalshaft 39. This shaft has bearing in the sleeve et() forming part of thebase 30 and at its upper end has the gear pinion il which meshes withthe gear @12 secured to the hub i3 of the work carrier R. This hub hasbearing engagement with the top of the base 80 and also with thevertical stub shaft el secured to and extending upwardly from the base30. A threaded nut Yl5 engages the upper end of the sha-ft to lock 'thecarrier on the base.

As best shown in Figs. 2 and 7, the base frame 10 has the parallelupstanding walls d6 and i7 provided with horizontal flanges t8 and 49 onwhich the base 230 seats and is slidable, strips and 51 being secured tothe base and engaging with the under sides of the flanges to therebyhold the base on its guideways. The base 30 is thus shiftable laterallyand is held in adjusted position by screws 52. During adjustment of thebase the shaft 25 slides in the hub 31.

The work carrier R has the top and bottom walls 53 and 5e and thecircular or cylindrical wall 55. At intervals the circular wall isdeflected outwardly to provide pairs of 'flanges and 57 each pairforming guides for a work holding table 58, the tables being slidabletransversely on the carrier parallel with its axis` Each table hasstrips 59 andi 60 secured thereto which engage against 'the under sidesof the franges to lock the table thereon. Each table between itssupporting flanges has depending walls 61 and G2 whose inner ends areconnected a plate 63, the walls and plate together with the vbody of thetable forming a rectangular passagewa)v for a cam head 64 which isbifurcated to receive a cam roller 65. AU its upper end each table has alug 66 in which.

is threaded an abutment bushing 67. The stein G8 extending from the camhead is guided in the lug 69 on the circular wall of the carrier frame.the upper end 70 of the stein being` of reduced diameter and extendinginto the bushing 67, a compression spring 71 encircling the stem betweenthe bushing and the washer 72 engaging on the stem and against theshoulder 7 3. A washer 74 is preferably inserted between the spring andthe bushing7 and normally when the cam roller is disengaged the tablewith the cam and stein thereon is supported on the ne; 139 through thespring and the washers.

(in top of the base 30 is the cam rail 75 which is successively engagedby the cam rollers of the various work holding tables,

engagement of a cam roller with the rail causing the respect-ive caniblock and its stein to be raised, such raising movement beingcommunicated by the washer 72 to the spring 7l and through the bushing67 to the respective work holding table so that work secured to thetable will be raised into position to be engaged by the grindingmechanism which will now be described. By means of the spring the workis yieldably app-lied to the grinding element, the spring protecting thecarrier against shocks and strains due to any irregularities in thegrinding.

ln the front housing frame 12 are the upper and lower journal boxstructures 7 6 and 7 7 for journaling the vertical shaft 78 on the lowerend of which is secured the head 79. By means of screws a circular plate81 is secured to the head concentric with the shaft 78 and on the sidesof this head are secured annular grinding disks 82 and 83. The plate 81maybe reversed on the head 80 so that after one of the grinding disks isworn away the other disk may be presented. rhe housing frame 12 isvertically shiftable on the ways Sel provided on the pedestal frame 11.At the upper end of the pedestal frame is journaled the vertical shaft85 which may be turned by the hand Wheel 86 and whose lower end isthreaded to engage in the lug 87 extending from the freine 12. By meansof this shaft the frame 12 may be raised or lowered.

Secured to the grinding wheel shaft 78 is the bevel gear 88 with whichmeshes the bevel pinion 89 on the` front end of the horizontal shaft 90which is journaled in the extension 91 on frame 12 and which at its rearend carries the gear pinion 92. The rear end of the extension 91supports the bearing housing 93 in which is journaled the vertical hub9d in which the vertical shaft 95 is splined. Secured to the hub is thebevel gear 96 which meshes with the pinion 92. Atits lower end the shaft95 has bearing in the journal box 97 supported on the base frame 10 andhas the bevel pinion 98 thereon which meshes with the bevel gear 18which is driven from the main shaft 15. The grinding element is thusdriven from the main shaft 15 and during vertical adjustment of thesupporting framework 12 the hub 94 slides along the shaft 95.

The vertical shafts .14 and 78 of the carrier frame and grinding wheelrespectively are odset laterally a distance so that the carrier frameand grinding disks overlap only partially, the carrier frame duringrotation carrying work on the holding tables across the grinding disknear the periphery thereof where the grinding speed and other conditionsare most efficient. As already described, the base 30 for the workcarrier structure is shiftable laterally so that the lcurately clamped.by the'operator.

area of application for work supported onl the carrier may be adjustedfor. Under certain conditions as, for example, where irregular work hasparts which will project across the top of the holding tables to beground, the frame l2 would be raised to vertically adjust the grinding'diskthe proper distance for efficient grinding. Such adjustment isquickly accomplished byV turning the hand wheel 86. f

The workman stands in front of the machine and Vowing to theV slow speedof the work carrier structure he can readily apply work to the tablesVduring operation of the machine. Usually fixtures are permanentlysecured to the tables in which fixtures the objects'to be ground can bequickly und ac- As the carrier revolves the respective cam rollersengagewith the cam Arail so that the holding tables are yieldably raisedto present the supported work against lthe grindingdisk. Owing to thecomparatively high speed oi the grinding element, grinding is rapidlyaccomplished. After the grinding disk von one side of the'supportingplate 81 is worn out thevplate is reversed to present the oppositiegrinding disk. During a grinding operation the work is pressed yieldablyagainst the grinding v`i'ace by the springs 7l, and l provide means forstopping further travel of the tables as soon as the proper degree ofgrinding has been accomplished. Referring to Fig.y l, eachtable isprovided with allug 99 through which threads a micrometer screwlOOivhichcan be readily turned by its knurled head lOl and which has a gauge dial102 thereon with which a pointer 103 cooperates.y On theV carrier anabutment lug lOfis provided for each niicrometer screw. The variousmicrometer screws are set bythe workmen accordingV to the depth of grinddesired and after a micrometer screw reaches its abutment grinding` willstop. The length oi the cam rail is such that the tables arenct Araiseduntil the work thereon is in position beow the grinding disk. After agrinding operation the rollers leave the rail and the tables drop totheir normal position, the'iinished 4work being then yremovedvvthereironi by` the operator.'

My improved machine and eiiicient construction. All the parts are amplyprotected by the various housings. The grinding element, except for! thegrinding area, is enclosed in a housing 105 which may be connected bypipe 106 with asuitable suction device (not shown) for conveying awaythe grinding dust.

. l claim as myV invention: Y

Vlui-*i grinding machine having, in coinbination, a grinding w-heelmounted to rotate on a vertical axis, a work carrier mountis of simple,rigid ed to revolve on a vertical axis below said plane and havinglongitudinal guides on' its periphery, work holding tables reciprocableon said guides to present work to the' grinding wheel as the carrierrevolves, and means for shifting said tables: toward the grinding wheelwhen the work is in grinding position. y y 3. In' a grinding machine ofthe class: described, tlie combinationoie a; grinding wheel adapted torotate on a vertical axis, a work carrier, a series voi'f work holdingtables shiftkable on the periphery or' said carrier, said carrier beingrotatable about a vertical axis to successively present said tables inrgrind- Ving position below said grinding wheel, and

abutment mechanism operative to shift said tables toward the grindingwheel when in .grinding position whereby work thereon will be ground. Yn

Il. In a grinding machine of rthe classdescribed, the combination of agrinding wheel adapted to rotate on a vertical axis, a work carrier,aseries of work holding tables shiftable on the-periphery of saidcarrier, said carrier being rotatable about a vertical axis tosuccessively present ysaid tables in grinding position below saidgrinding wheel, and yielding abutment*mechanism operative to shift saidtables toward the grinding wheel when in grinding position whereby work.thereon will be ground. v

5. A grinding machine having, in combination, Va grinding wheel, a workVcarrier rotatable about a vertical axis, a lug on the periphery of saidcarrier, a supporting tablemounted on the periphery of said carrier oversaid lug for vertical recipr-ocation, an inwardly extending lug on saidtable, a cam engaging member extending through said lugs'and having ashoulder norn ally engaging said lirst mentioned lug, a spring llO onSaid cam engaging member between said work holding tt bles verticallyreciprocable Von saidvguides for supporting work to be carried to thegrinding wheel by the carrier, a yieldable abutment for each table, anda ned abutment with which said yieldable abutnients successively engageduring rotation of the carrier, engagement of the kabutments causing therespective tables to be raised to apply work thereon to the grindingwheel.

Y. ln a grinding machine of the class describedl the combination of asupporting base, a vertical frame on one end of said base, a housingframe supported on said Vertical frame and overhanging the other end ofsaid hase, a. vertical shaft journaled in said housing frame, a grindingwheel supported thereon, a work carrying drum having a vertical spindle.mounted in said base below said housiA j frame, a single power meansoperatively connected to said vertical shaft and said vertical spindle,means for varying the velocity ratio Of said vertical spindle withrespect to said vertical shaft, means for disconnecting said verticalspindle from said source of power, and means for adjusting said workcarrying drum laterally to vary the degree of overlap between said drumand said grinding wheel without breaking said power connection.

8. ln a grinding machine of the class described, the combination of anenc-losing frame, a pair of spindles mounted in said frame, saidspindles carrying operative elements arranged in overlapping position, ahorizontal power shaft operatively connected with one of said spindles,a parallel shaftgeared to said first mentioned shaft, another parallelshaft geared to said other spindle, speed change mechanism connectingsaid last mentioned shaft to said second mentioned shaft, said lastmentioned shaft being capable of longitudinal adjustment Withoutbreaking said power connection, and clutch means for breaking the powerconnection to said last mentioned spindle, said machine frame serving tocompletely enclose all said shafts, connections| and means.

9. A. grinding machine having, in combination, a supporting base, avertical frame on one end of said base, said frame supporting a grindingwheel mounted for rotation about a vertical axis, a work carrying drummounted on said base below said grinding wheel for rotation about avertical axis, said drum and said wheel being arranged in overlappingposition, a plurality of vertically reciprocable work holding tablesmounted on the outer periphery ofsaid drum, actuating means locatedwithin said drum on the inner side of each table for actuating thelatter as it is carried across the face of said grinding wheel, saidtables being constructed on their outer faces with a plurality of slot-sfor supporting work blanks, and means within said frame and base fordriving said grinding wheel and said drinn in synchronous relation.

l0. A grinding machine of the class described, having, in combination, asupporting base, a vertical frame on said base, a housing framevertically adjustable on said frame and overhanging one end of saidbase, a .'irinding wheel supported on said housing for rotation about avertical axis, horizontal frame on the other end of said base. a workcarrier supported on said horizontal frame for rotation about a verticalaxis, said carrier being below said grinding wneel and partiallyoverhung thereby, a ni horizontal shaft geared to said drive shaft belowsaid vertical frame, a horizontal shaft extending below said workcarrier and being geared to said first mentioned horizontal shaft, avertical work carrier spindle geared to said last mentioned horizontalshaft, a rei-tical shaft in said vertical frame geared to said lirstmentioned horizontal shaft, a vertical shaft supporting said grindingwheel, and a horizontal shaft in said housing frame geared to bothvertical shafts to effect a connection therebetween.

ll. ln grinding machine of the class described, the combination of asupporting base, a vertical frame on one end of said base, a housingframe supported on said vertical frame and overhanging the other end ofsaid base, a vertical shaft journaled in said housing frame, a grindingwheel supported thereon, a work carrier having a vertical spindlemounted on said base below said housing frame, a Vertical shaft in saidvertical frame, a horizontal shaft in said housing frame and connectingsaid vertical shafts, a main drive shaft journaled in said base, andmeans within said base for connecting said vertical spindle and saidlast mentioned vertical shaft to said main drive shaft.

l2. ln a grinding machine of the class described, the combination of asupporting base, a vertical frame on said base overhanging one endthereof, a grinding wheel supported on said vertical frame for rotationabout a vertical axis, a horizontal fra-ine on the other end of saidbase, a work carrier revolvable on said horizontal frame about avertical axis, said carrier being below said grinding wheel andpartially overhang thereby, work holding sections on said carriershiftable vertically on the outer periphery thereof, said sections beingsuccessively carried into position below said grinding wheel duringrotation of said carrier, means for raising said sections when travelingbelow said grinding wheel whereby work thereon will be applied to thegrinding .in drive shaft journaled in said base, av

Wheel to be ground, and means for Shifting said horizontal frame on saidbase to thereby adjust the degree ofroverhang of said grinding Wheelwith reference to said oarrier,

13. In a grinding machine or' the class described, the combination oi aSupporting base, a vertical frame onsaid bese overl'ianging one endthereof, a grinding Wheel supported on said vertical fra-ine forrotation about a vertical axis, a horizontal frame on the other end ofsaid base, a Work earrier revolvable on said horizontal base about avertical axis, said carrier being below said grinding Wheel andpartially overhung thereby, work holding sections on said earriershiftable vertically on the outer periphery thereof, Said sections beingSuccessive-ly carried into position below said grinding Wheel duringrotation of said carrier, means for raising said sections When travelingbelow said grinding Wheel whereby Work thereon will be applied to thegrinding Wheel to be ground, means for shifting said horizontal freineon saidk base to thereby adjust the degree of overhang of said grindingWneel with reference to said carrier, and means ror bodilyverticallyadiusting seid grinding Wheel.

In testimony whereof, I have yhereuntoset my hand.

FREDERIC GARDNER.

